My younger brother sent a bottle for Christmas. I'm told that Nadurra is Scotish for "natural." This is a cask-strength single malt. It checks in just shy of 120 proof (most whiskey is served at about 80 proof). I suppose that some may drink it straight, but a cask-strenth whiskey is supposed to be cut with water when served. If you don't cut it down, the taste of the alcohol will pretty much overwhelm the more subtile flavors and you'll miss -- waste -- a lot. I've been cutting it about 33% (two parts whiskey to one part water) and enjoying it very much.
It's 16 years old and displays great complexity. It's much better than Glenlivet's ordinary 12-year old which is a bit flat for my enjoyment.